HSA contribution clarification

My wife and I are both over 55, semi retired but not 65. I contribute to our HSA that I took with me when I left my old job. She has been a stay at home wife and mother. It covers us both.

The wording on the IRS web site has me a bit confused.

We have 1 family HSA. I believe we can contribute $3500 each to it and as we are both over 55 an extra $1000 each for a total of $9000 for this year.

Additional contribution. If you are an eligible individualwho is age 55 or older at the end of your tax year, yourcontribution limit is increased by $1,000.

Rules for married people. If either spouse has family HDHP coverage, both spouses are treated as havingfamily HDHP coverage. If each spouse has family coverage under a separate plan, the contribution limit for 2018is $6,900. You must reduce the limit on contributions, before taking into account any additional contributions, bythe amount contributed to both spouses’ Archer MSAs.After that reduction, the contribution limit is split equallybetween the spouses unless you agree on a different division.The rules for married people apply only if bothspouses are eligible individuals.If both spouses are 55 or older and not enrolled in Medicare, each spouse’s contribution limit is increased by theadditional contribution. If both spouses meet the age requirement, the total contributions under family coveragecan’t be more than $8,900. Each spouse must make theadditional contribution to his or her own HSA.

When I read the Irs Web site it mentions we can do the extra $1000 but she must put it in her individual family HSA. WTH???

Must we have two seperate HSA's?

What is my real conributon for 2019 allowed.

Last question.

As weI approach age 65 and medicare can we still make a prorated contributon for that year we attain 65 or are we shut out for the entire year though the birthdays are in the latter half of the year.